Projectile has a single force that acts upon it - the force of gravity. If there were any other force acting upon an object, then that object would not be a projectile.
Flickr Physics - take a visual tour of projectile motion.
free-body diagram of a projectile would show a single force acting downwards and labeled force of gravity (or simply Fgrav). Regardless of whether a projectile is moving downwards, upwards, upwards and rightwards, or downwards and leftwards, the free-body diagram of the projectile is still as depicted in the diagram at the right. By definition, a projectile is any object upon which the only force is gravity.
force - any influence that can produce a change in the speed, direction or shape of an object.
Engineering ideas
motion, Newton's laws of motion, 1-dimension, 2-dimensions, force, gravity, kinematic principles, projectile, air resistance, inertia, acceleration, parabolic trajectory
Projectile has a single force that acts upon it - the force of gravity. If there were any other force acting upon an object, then that object would not be a projectile.
Physics of Skateboarding - Learn about the physics of skateboarding.
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